Three defense contractors and one U.S. military service member were killed Thursday in a plane crash in the Province of Maguindanao del Sur, Philippines.

“The aircraft was providing intelligence, surveillance, and reconnaissance and crashed during a “routine mission,” according to a statement from U.S. Indo-Pacific Command. “We can confirm no survivors of the crash. There were four personnel on board, including one U.S. military service member and three defense contractors.”